An eastward propagating compressional Pc 5 wave observed by AMPTE/CCE in the postmidnight sector

Details An eastward propagating compressional Pc 5 wave observed by AMPTE/CCE in the postmidnight sector An eastward propagating compressional Pc 5 wave observed by AMPTE/CCE in the postmidnight sector

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9213472t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 1, 1987, p. 13472-13484.

Computer Science

Sound

17

Magnetometers, Mass Spectrometers, Proton Energy, Radiation Counters, Satellite Sounding, Magnetic Field Configurations, Perturbation Theory

Scientific paper

This paper presents a detailed analysis of a compressional Pc 5 wave observed in the postmidnight sector on July 21, 1986, using data from the magnetometer, the charge-energy-mass spectrometer, and the medium-energy particle analyzer aboard the AMPTE/Charge Composition Explorer (CCE) spacecraft. The Pc 5 wave exhibited harmonically related transverse and compressional magnetic oscillations, modulation of the flux of medium energy protons, and a large azimuthal wave number, i.e., properties that are similar to those of compressional Pc5 waves observed previously at geostationary orbit. The unique observations recorded by the AMPTE/CCE included the occurrence of the wave in the postmidnight sector, its sunward propagation with respect to the spacecraft, and the left-handed polarization of the perturbed magnetic field. In spite of the morphological uniqueness observed, the excitation of the July 21 event is considered to be due to the same type of instability as operates at geostationary orbit.

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